scholarly journals Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

2020 ◽  
Author(s):  
Shipai Song ◽  
Xiang Peng ◽  
Kai Huang ◽  
Hao Zhang ◽  
Fang Wu ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Coating Materials ◽  
Stability Issue ◽  
Rate Capacity ◽  
The Stability ◽  
Stability Issues

Abstract The stability issue of LiCoO 2 cycled at high voltages is one of the burning questions for the development of lithium ion batteries with high energy density and long cycling life. Although it is effective to improve the cycling performance of LiCoO 2 via coating individual LiCoO 2 particles with another metal oxides or fluorides, the rate capacity is generally compromised because the typical coating materials are poor conductors. Herein, amorphous Li 0.33 La 0.56 TiO 3 , one of the most successful solid electrolytes, was directly deposited on the surface of made-up LiCoO 2 cathode plates through magnetron sputtering. Not only the inherent conductive network in the made-up LiCoO 2 cathode plates was retained, but also the Li + transport in bulk and across the cathode-electrolyte interface was enhanced. In addition, the surface chemical analysis of the cycled LiCoO 2 cathode plates suggests that most of the stability issues can be addressed via the deposition of amorphous Li 0.33 La 0.56 TiO 3 . With an optimized deposition time, the LiCoO 2 cathode plates modified by Li 0.33 La 0.56 TiO 3 performed a steady reversible capacity of 150 mAh/g at 0.2 C with the cut-off voltage from 2.75 to 4.5 V vs. Li + /Li, and an 84.6% capacity gain at 5 C comparing with the pristine one.

scholarly journals Improved cycling stability of LiCoO2 at 4.5 V via surface modification of electrodes with conductive amorphous LLTO thin film

2020 ◽  
Author(s):  
Shipai Song ◽  
Xiang Peng ◽  
Kai Huang ◽  
Hao Zhang ◽  
Fang Wu ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Coating Materials ◽  
Stability Issue ◽  
Rate Capacity ◽  
The Stability ◽  
Stability Issues

Abstract The stability issue of LiCoO 2 cycled at high voltages is one of the burning questions for the development of lithium ion batteries with high energy density and long cycling life. Although it is effective to improve the cycling performance of LiCoO 2 via coating individual LiCoO 2 particles with another metal oxides or fluorides, the rate capacity is generally compromised because the typical coating materials are poor conductors. Herein, amorphous Li 0.33 La 0.56 TiO 3 , one of the most successful solid electrolytes, was directly deposited on the surface of made-up LiCoO 2 electrodes through magnetron sputtering. Not only the inherent conductive network in the made-up LiCoO 2 electrodes was retained, but also the Li + transport in bulk and across the cathode-electrolyte interface was enhanced. In addition, the surface chemical analysis of the cycled LiCoO 2 electrodes suggests that most of the stability issues can be addressed via the deposition of amorphous Li 0.33 La 0.56 TiO 3 . With an optimized deposition time, the LiCoO 2 electrodes modified by Li 0.33 La 0.56 TiO 3 performed a steady reversible capacity of 150 mAh/g at 0.2 C with the cut-off voltage from 2.75 to 4.5 V vs. Li + /Li, and an 84.6% capacity gain at 5 C comparing with the pristine one.

scholarly journals Enhanced cycling performance and high energy density of LiFePO4 based lithium ion batteries

2007 ◽  
Vol 61 (25) ◽  
pp. 4700-4702 ◽  
Author(s):  
Yi-Jie Gu ◽  
Cui-Song Zeng ◽  
Hui-Kang Wu ◽  
Hong-Zhi Cui ◽  
Xiao-Wen Huang ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Cycling Performance ◽  
High Energy ◽  
High Energy Density

scholarly journals High-Performance Lithium-Rich Layered Oxide Material: Effects of Preparation Methods on Microstructure and Electrochemical Properties

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 334 ◽  
Author(s):  
Qiming Liu ◽  
Huali Zhu ◽  
Jun Liu ◽  
Xiongwei Liao ◽  
Zhuolin Tang ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Layered Structure ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Voltage Decay ◽  
Rate Capacity ◽  
Co Precipitation

Lithium-rich layered oxide is one of the most promising candidates for the next-generation cathode materials of high-energy-density lithium ion batteries because of its high discharge capacity. However, it has the disadvantages of uneven composition, voltage decay, and poor rate capacity, which are closely related to the preparation method. Here, 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 was successfully prepared by sol–gel and oxalate co-precipitation methods. A systematic analysis of the materials shows that the 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 prepared by the oxalic acid co-precipitation method had the most stable layered structure and the best electrochemical performance. The initial discharge specific capacity was 261.6 mAh·g−1 at 0.05 C, and the discharge specific capacity was 138 mAh·g−1 at 5 C. The voltage decay was only 210 mV, and the capacity retention was 94.2% after 100 cycles at 1 C. The suppression of voltage decay can be attributed to the high nickel content and uniform element distribution. In addition, tightly packed porous spheres help to reduce lithium ion diffusion energy and improve the stability of the layered structure, thereby improving cycle stability and rate capacity. This conclusion provides a reference for designing high-energy-density lithium-ion batteries.

scholarly journals S-containing and Si-containing compounds as highly effective electrolyte additives for SiOx -based anodes/NCM 811 cathodes in lithium ion cells

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Fuqiang An ◽  
Hongliang Zhao ◽  
Weinan Zhou ◽  
Yonghong Ma ◽  
Ping Li
Keyword(s):  
Photoelectron Spectroscopy ◽  
Elevated Temperatures ◽  
Electrochemical Impedance ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
High Energy ◽  
High Energy Density ◽  
Full Cell

Abstract Recently, high-energy density cells containing nickel-rich cathodes and silicon-based anodes have become a practical solution for increasing the driving range of electric vehicles. However, their long-term durability and storage performance is comparatively poor because of the unstable cathode-electrolyte-interphase (CEI) of the high-reactivity cathode and the continuous solid-electrolyte-interphase (SEI) growth. In this work, we study several electrolyte systems consisting of various additives, such as S-containing (1,3,2-dioxathiolane 2,2-dioxide (DTD), DTD + prop-1-ene-1,3-sultone (PES), methylene methanedisulfonate (MMDS)) and Si-containing (tris(trimethylsilyl) phosphate (TTSP) and tris(trimethylsilyl) borate (TMSB)) compounds, in comparison to the baseline electrolyte (BL = 1.0 M LiPF6 + 3:5:2 w-w:w EC: EMC: DEC + 0.5 wt% lithium difluoro(oxalato)borate (LiDFOB) + 2 wt% lithium bis(fluorosulfonyl)imide (LiFSI) + 2 wt% fluoroethylene carbonate (FEC) + 1 wt% 1,3-propane sultone (PS)). Generally, electrolytes with Si-containing additives, particularly BL + 0.5% TTSP, show a lower impedance increase in the full cell, better beginning-of-life (BOL) performance, less reversible capacity loss through long-term cycles and better storage at elevated temperatures than do electrolytes with S-containing additives. On the contrary, electrolytes with S-containing additives exhibit the advantage of low SEI impedance but yield a worse performance in the full cell than do those with Si-containing additives. The difference between two types of additives is attributed to the distinct function of the electrodes, which is characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS), which was performed on full cells and half cells with fresh and harvested electrodes.

scholarly journals Ordered LiNi0.5Mn1.5O4 Cathode in Bis(fluorosulfonyl)imide-Based Ionic Liquid Electrolyte: Importance of the Cathode-Electrolyte Interphase

2020 ◽  
Author(s):  
Hyeon Jeong Lee ◽  
Zachary Brown ◽  
Ying Zhao ◽  
Jack Fawdon ◽  
Weixin Song ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
High Voltage ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
X Ray ◽  
Ionic Liquid Electrolyte

<div><div><div><p>The high voltage (4.7 V vs. Li+ /Li) spinel lithium nickel manganese oxide (LiNi0.5 Mn1.5 O4 , LNMO) is a promising candidate for the next-generation of lithium ion batteries due to its high energy density, low cost and environmental impact. However, poor cycling performance at high cutoff potentials limits its commercialization. Herein, hollow structured LNMO is synergistically paired with an ionic liquid electrolyte, 1M lithium bis(fluorosulfonyl)imide (LiFSI) in N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (Pyr1,3 FSI) to achieve stable cycling performance and improved rate capability. The optimized cathode-electrolyte system exhibits extended cycling performance (>85% capacity retention after 300 cycles) and high rate performance (106.2mAhg–1 at 5C) even at an elevated temperature of 65 ◦C. X-ray photoelectron spectroscopy and spatially resolved x-ray fluorescence analyses confirm the formation of a robust, LiF-rich cathode electrolyte interphase. This study presents a comprehensive design strategy to improve the electrochemical performance of high-voltage cathode materials.</p></div></div></div>

scholarly journals Reviewing the Safe Shipping of Lithium-Ion and Sodium-Ion Cells: A Materials Chemistry Perspective

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Ashish Rudola ◽  
Christopher J. Wright ◽  
Jerry Barker
Keyword(s):  
Lithium Ion ◽  
Current Collector ◽  
Cycling Performance ◽  
High Energy ◽  
Sodium Ion ◽  
High Energy Density ◽  
Materials Chemistry ◽  
Li Ion Batteries ◽  
International Regulations ◽  
Li Ion

High energy density lithium-ion (Li-ion) batteries are commonly used nowadays. Three decades’ worth of intense research has led to a good understanding on several aspects of such batteries. But, the issue of their safe storage and transportation is still not widely understood from a materials chemistry perspective. Current international regulations require Li-ion cells to be shipped at 30% SOC (State of Charge) or lower. In this article, the reasons behind this requirement for shipping Li-ion batteries are firstly reviewed and then compared with those of the analogous and recently commercialized sodium-ion (Na-ion) batteries. For such alkali-ion batteries, the safest state from their active materials viewpoint is at 0 V or zero energy, and this should be their ideal state for storage/shipping. However, a “fully discharged” Li-ion cell used most commonly, composed of graphite-based anode on copper current collector, is not actually at 0 V at its rated 0% SOC, contrary to what one might expect—the detailed mechanism behind the reason for this, namely, copper dissolution, and how it negatively affects cycling performance and cell safety, will be summarized herein. It will be shown that Na-ion cells, capable of using a lighter and cheaper aluminum current collector on the anode, can actually be safely discharged to 0 V (true 0% SOC) and beyond, even to reverse polarity (negative voltages). It is anticipated that this article spurs further research on the 0 V capability of Na-ion systems, with some suggestions for future studies provided.

scholarly journals Porous Co2VO4 Nanodisk as a High-Energy and Fast-Charging Anode for Lithium-Ion Batteries

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Jinghui Ren ◽  
Zhenyu Wang ◽  
Peng Xu ◽  
Cong Wang ◽  
Fei Gao ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
High Capacity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
High Energy ◽  
High Specific Surface Area ◽  
High Energy Density ◽  
Safety Issues ◽  
Fast Charging

AbstractHigh-energy–density lithium-ion batteries (LIBs) that can be safely fast-charged are desirable for electric vehicles. However, sub-optimal lithiation potential and low capacity of commonly used LIBs anode cause safety issues and low energy density. Here we hypothesize that a cobalt vanadate oxide, Co2VO4, can be attractive anode material for fast-charging LIBs due to its high capacity (~ 1000 mAh g−1) and safe lithiation potential (~ 0.65 V vs. Li+/Li). The Li+ diffusion coefficient of Co2VO4 is evaluated by theoretical calculation to be as high as 3.15 × 10–10 cm2 s−1, proving Co2VO4 a promising anode in fast-charging LIBs. A hexagonal porous Co2VO4 nanodisk (PCVO ND) structure is designed accordingly, featuring a high specific surface area of 74.57 m2 g−1 and numerous pores with a pore size of 14 nm. This unique structure succeeds in enhancing Li+ and electron transfer, leading to superior fast-charging performance than current commercial anodes. As a result, the PCVO ND shows a high initial reversible capacity of 911.0 mAh g−1 at 0.4 C, excellent fast-charging capacity (344.3 mAh g−1 at 10 C for 1000 cycles), outstanding long-term cycling stability (only 0.024% capacity loss per cycle at 10 C for 1000 cycles), confirming the commercial feasibility of PCVO ND in fast-charging LIBs.

Electronic modulation of nickel selenide by copper doping and in situ carbon coating towards high-rate and high-energy density lithium ion half/full batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (46) ◽  
pp. 23645-23652
Author(s):  
Jingrui Shang ◽  
Huilong Dong ◽  
Hongbo Geng ◽  
Binbin Cao ◽  
Haidong Liu ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
High Energy ◽  
High Rate ◽  
High Energy Density ◽  
Ion Transfer ◽  
Copper Doping ◽  
High Reversible Capacity

Copper doping and in situ carbon coating of nickel selenide composites with rapid electron/ion transfer kinetics manifest greatly boosted electrochemical performance in terms of high reversible capacity, stable cycling and good rate performances.

scholarly journals Synthesis and Electrochemical Properties of Bi2MoO6/Carbon Anode for Lithium-Ion Battery Application

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1132 ◽  
Author(s):  
Tingting Zhang ◽  
Emilia Olsson ◽  
Mohammadmehdi Choolaei ◽  
Vlad Stolojan ◽  
Chuanqi Feng ◽  
...  
Keyword(s):  
Density Functional ◽  
Electrode Materials ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
High Energy ◽  
Carbon Composite ◽  
High Energy Density ◽  
Carbon Anode ◽  
Li Ion

High capacity electrode materials are the key for high energy density Li-ion batteries (LIB) to meet the requirement of the increased driving range of electric vehicles. Here we report the synthesis of a novel anode material, Bi2MoO6/palm-carbon composite, via a simple hydrothermal method. The composite shows higher reversible capacity and better cycling performance, compared to pure Bi2MoO6. In 0–3 V, a potential window of 100 mA/g current density, the LIB cells based on Bi2MoO6/palm-carbon composite show retention reversible capacity of 664 mAh·g−1 after 200 cycles. Electrochemical testing and ab initio density functional theory calculations are used to study the fundamental mechanism of Li ion incorporation into the materials. These studies confirm that Li ions incorporate into Bi2MoO6 via insertion to the interstitial sites in the MoO6-layer, and the presence of palm-carbon improves the electronic conductivity, and thus enhanced the performance of the composite materials.

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